Feeling the winter blues? It could actually be a real condition known as SAD, or Seasonal Affective Disorder.
"It would be a kind of a depression that's particularly connected to the changes in the seasons," explains psychiatrist Dr. Robert Olson of Fargo, North Dakota's Sanford Medical Center.
While there is no definitive answer as to what causes Seasonal Affective Disorder, Dr. Olson has a theory.
"We are animals," he explains. "The birds, they fly south. The bears hibernate. Those are driven by the day light in the same way we are affected by day light."
The symptoms that people experience are strikingly similar to that of depression.
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